EEE Job Interview Question Answer [ Part 6 ] motor
EEE Job Interview Question Answer [ Part 6 ]
1.Question 1
In both the North American and International motor efficiency standards, how does the desired efficiency vary as a function of the motor power?
The efficiency decreases because the power increases, but just for certain classes of motor
2.Question 2
Suppose the corporate decides to sell a far larger cement mixer which will mix 10 cubic yards of concrete in quarter-hour, with the blending drum rotating at the identical speed as before. Accordingly, the self-mixing drum are made much larger, but the remainder of the mixer will look the identical. what's going to you wish to vary about the motor you specify now?
The power starting torque and operating torque will must be incresed
3.Question 3
Which of those statements a couple of manual starting system for a full voltage, reversing 3-phase motor is true?
The mechanical interlock prevents actuation of the forward and reverse buttons at the identical time
4.Question 4
You have an application where the motor are exposed to dirt and dampness, but not in an environment where flammable dust or gases are located. you have got no concerns about the motor overheating. What sort of motor enclosure does one need?
TENV
5.Question 5
Suppose you would like to shop for a motor for a chemical operation that creates propane 500 hours annually. the remainder of the time the motor isn't used. you would like an intrinsically safe motor. The ambient temperature doesn't exceed 40° C. in line with the North American ratings, what explosion proof rating of motor do you have to purchase?
Class 1,
Zone 1, AEx, i,II, T6
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